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When to plant crocuses in Gangneung: 22 October – end of December

In Gangneung, crocus: plant from 22 October to the end of December.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The average daily temperature here stays above 0 °C all winter, and at least three months average 7 °C or less: our rule of thumb for the winter cold spring bulbs need. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS.

Crocus in Gangneung: soil, season and weather

Nights then average below 0 °C in December–February; the coldest, January, averages -3.1 °C.

Planting22 October – end of December
First autumn frost21 November
Coldest nightsJanuary, -3.1 °C
Soil back at 1 °C in springalready in the first week of January
Daylight11:00 on 22 October
Daylight at the winter solstice9:33

The same dates in Gangneung hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Gangneung: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Gangneung the average daily temperature stays at 10 °C or lower for about 20 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

1 of the nearest cities share Gangneung's date.

CityDistanceDateDifference
Chuncheon103 km1 October – 22 November21 days earlier
Seoul169 km7 October – 26 November15 days earlier
Daejeon205 km13 October – 5 December9 days earlier
Daegu211 km22 October – end of Decembersame day
Ulsan248 km17 October – end of December5 days earlier
Jeonju265 km18 October – 17 December4 days earlier

Questions

When to plant crocuses in Gangneung?

In Gangneung, crocus: plant from 22 October to the end of December. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Gangneung?

Last spring frost around 19 March, first autumn frost around 21 November.

Other crops in Gangneung, with their dates